上接稳扎稳打Silverlight(19) - 2.0通信之调用REST服务，处理JSON格式, XML格式, RSS/ATOM格式的数据

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Net; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Documents; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Animation; 
using System.Windows.Shapes; 
 
using System.Xml; 
using System.IO; 
using System.ServiceModel.Syndication; 
 
namespace Silverlight20.Communication 
{ 
         public partial  class RssAtom : UserControl 
        { 
                 public RssAtom() 
                { 
                        InitializeComponent(); 
 
                         // 演示如何处理 Rss/Atom 
                        RssDemo(); 
                } 
 
                 /// <summary> 
                 /// 演示如何处理 Rss/Atom 
                 /// </summary> 
                 void RssDemo() 
                { 
                         // 让一个代理页面去请求相关的 Rss/Atom（如果用Silverlight直接去请求，则需要在目标域的根目录下配置策略文件） 
                        Uri uri =  new Uri( "http://localhost:3036/Proxy.aspx?url=http://webabcd.cnblogs.com/rss", UriKind.Absolute); 
 
                        // 实例化 WebClient 
                        System.Net.WebClient client = new System.Net.WebClient(); 
 
                        client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(rss_DownloadStringCompleted); 
                        client.DownloadStringAsync(uri); 
 
                        txtMsgRss.Text = "读取 RSS 数据中。。。"; 
                } 
 
                void rss_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
                { 
                        if (e.Error != null) 
                        { 
                                // 发生错误的话，则打印出来 
                                txtMsgRss.Text = e.Error.ToString(); 
                                return; 
                        } 
 
                        // 将获得的字符串转换为 XmlReader 
                        var buffer = System.Text.Encoding.UTF8.GetBytes(e.Result); 
                        var ms = new MemoryStream(buffer); 
                        XmlReader reader = XmlReader.Create(ms); 
 
                        // 从指定的 XmlReader 中加载，以生成 SyndicationFeed 
                        SyndicationFeed feed = SyndicationFeed.Load(reader); 
 
                        // 设置 list 的数据源为 Rss/Atom 的项集合（SyndicationFeed.Items） 
                        list.ItemsSource = feed.Items; 
                        txtMsgRss.Text = e.Result + "\r\n"; 
                } 
 
                private void list_SelectionChanged(object sender, SelectionChangedEventArgs e) 
                { 
                        // 设置 detail 的数据上下文为 Rss/Atom 的指定项（SyndicationItem） 
                        detail.DataContext = list.SelectedItem as SyndicationItem; 
                } 
        } 
}